Tonometer, London, England, 1870-1900

Made:
1870-1900 in London
maker:
Pickard and Curry

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Science Museum Group Collection
© The Board of Trustees of the Science Museum

Brass tonometer, for measuring ocular pressure in leather covered case, by Pickard and Curry, 195 Great Portland Street, London, England, 1870-1900.

Tonometers measure pressure within the eye. This is known as intraocular pressure. Glaucoma is a condition where the optic nerve becomes damaged leading to loss of sight. Glaucoma raises intraocular pressure. Tonometers were refined in the 1880s by German physiologist Adolph Eugene Fick (1829-1901). Cocaine was introduced as a local anaesthetic in 1887. This allowed tonometers to be applied directly to the cornea. This brass tonometer was made by instrument makers Pickard and Curry of London.

Details

Category:
Ophthalmology
Object Number:
A606932/1
Materials:
instrument, brass, instrument, glass, instrument, ivory and instrument, steel
Measurements:
overall (main body): 70 mm x 23 mm x 23 mm, .1kg
overall (brass ring): 22 mm 25 mm,
type:
ophthalmic tonometer